Kabupaten Minahasa Tenggara mengalami peningkatan penduduk setiap tahunnya. Peningkatan ini mengakibatkan volume dan jenis sampah juga mengalami peningkatan. Tempat Pemrosesan Akhir (TPA) Sampah merupakan tahap akhir dari pemrosesan sampah dimana sampah hasil pengumpulan atau pengangkutan maupun sisa hasil dari pemrosesan daur ulang disuatu daerah atau kota ditampung untuk dikelola. Untuk itu TPA harus dipersiapkan dengan baik dan sesuai dengan standar yang berlaku agar tidak mencemari lingkungan sekitar dan berdampak buruk bagi masyarakat. Tujuan dari penelitian ini adalah 1) mengetahui tahapan pemilihan lokasi TPA sesuai standar yang berlaku menggunakan Sistem Informasi Geografis (SIG); 2) mengetahui dimana alternatif lokasi tempat pemrosesan akhir (TPA) sampah di Kab. Minahasa Tenggara. Metode yang digunakan adalah deskriptif kuantitatif. Berdasarkan hasil penelitian bahwa, tahapan pemilihan lokasi TPA berdasarkan SNI 03-3241-1994 dan Peraturan Menteri PU Republik Indonesia Nomor 03/PRT/M/2013 terdapat 3 tahapan yaitu Tahap Regional , Tahap Penyisih dan Tahap Penetapan . Tiga tahap tersebut dianalisis menggunakan SIG dengan metode Buffering dan Overlay dengan pendekatan kuantitatif Binary. Lokasi yang menjadi alternatif TPA dengan perolehan skor tertinggi 311 yaitu berada di Kecamatan Pusomaen. Lokasi tersebut berada cukup jauh dengan lokasi TPA eksisting sehingga alternatif TPA terpilih ini dapat menjadi masukan bagi pemerintah untuk perencanaan tata ruang di wilayah Kabupaten Minahasa Tenggara.
Minamata Bay which suffered from a major disaster called "Minamata Disease" has already remediated from 1977 to 1990 by carried out highly mercury (Hg) contaminated sediment and reclaimed it in the bay area. Furthermore, many studies reported that the mercury has reached Yatsushiro Sea, the outer part of Minamata Bay. It can be assumed that the sediment transport still occurs from remaining Hg concentration even after the remediation project. In order to investigate it, we try to simulate the transport of sediment contaminated by Hg from Minamata Bay to the Yatsushiro Sea with different coastal morphology on before and after the reclamation projects.Sediment transport and tidal flow with rectangular variable grid both before and after reclamation conditions around the Yatsushiro Sea and Minamata Bay are simulated by DELFT3D. The initial bottom sediment thickness of 1m is set in the only inner side of the bay and six months simulation results for both before and after reclamation area are compared. The change of hydrodynamic condition inside Minamata Bay due to the remediation project gives a slight change in sediment transport pattern. It is estimated that after the reclamation, the sediment transport moves slower than before it due to the change of its magnitude of velocity above the seabed. As an important result, it is clarified that a change of the amount of bottom sediment which can be re-suspended in Minamata Bay caused by the topographical change can also affect the pattern. Also, this result suggests that the southern part of Yatsushiro Sea can be influenced by sediment contaminated by higher Hg included before the reclamation project.
We have been attempting to develop the numerical model for mercury fate in Minamata Bay and Yatsushiro Sea. In this paper we compared numerical results of bottom sediment transport from the bay to the outer sea area for one year with and without sea water and freshwater stratification. As a result, it was clarified that long term bottom sediment transport was determined by both of barotropic currents and baroclinic ones. Thus, accurate numerical model for particulate mercury fate must take into account baroclinic structure in actual coastal area due to freshwater inflow.
This research was conducted to examine the condition (location, depth, and thickness) of the aquifer, to assess the humidity level using the NDW index, and to determine the relationship between aquifer conditions and the sustainability of the geothermal system using the geoelectrical method of resistivity in the North Langowan geothermal area. The comparison between rock layer resistivity data and spectral values based on geological-hydrogeological maps was carried out to determine the relationship between aquifer conditions and humidity levels in the geothermal area to the continuity of the geothermal system in the Tompaso region. The data was processed using IP2WIN and ILWIS programs. The results showed that at the research site there were semi-confined aquifers and free aquifers, which were indicated by low resistivity values. It can be concluded that the aquifer in the North Langowan geothermal area was at a depth ranging from 0 m to 16 m with a thickness ranging from 3.98 to 12 m, moderate wetness, and has a good relationship in supporting the continuity of the Tompaso geothermal system.Indonesian title: Analisis akuifer, tingkat kelembaban dengan nilai resistivitas geolistrik, dan Index NDW di daerah panas bumi Langowan Utara
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